docs: def post_message(self, channel_id, message, **kwargs):
          """
          Send a message using the slack Event API.
  
          Event messages should be used for more complex messages. See
          https://api.slack.com/methods/chat.postMessage for details on arguments can be included
          with your message.
  
          When using the post_message API, to have your message look like it's sent from your bot
          you'll need to include the `as_user` kwarg. Example of how to do this:
              server.slack.post_message(msg['channel'], 'My message', as_user=server.slack.username)
          """
          params = {
              "post_data": {
                  "text": message,
                  "channel": channel_id,
              }
          }
          params["post_data"].update(kwargs)
  
          return self.api_call("chat.postMessage", **params)